update seo template

internal/base/server/http_funcmap.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/answerdev/answer/internal/base/translator"
+	"github.com/answerdev/answer/internal/controller"
 	"github.com/answerdev/answer/internal/schema"
 	"github.com/answerdev/answer/pkg/converter"
 	"github.com/answerdev/answer/pkg/day"
@@ -41,6 +42,9 @@ var funcMap = template.FuncMap{
 	"templateHTML": func(data string) template.HTML {
 		return template.HTML(data)
 	},
+	"formatLinkNofollow": func(data string) template.HTML {
+		return template.HTML(FormatLinkNofollow(data))
+	},
 	"translator": func(la i18n.Language, data string, params ...interface{}) string {
 		trans := translator.GlobalTrans.Tr(la, data)
 
@@ -116,3 +120,21 @@ var funcMap = template.FuncMap{
 		return htmltext.UrlTitle(title)
 	},
 }
+
+func FormatLinkNofollow(html string) string {
+	var hrefRegexp = regexp.MustCompile("(?m)<a.*?[^<]>.*?</a>")
+	match := hrefRegexp.FindAllString(html, -1)
+	if match != nil {
+		for _, v := range match {
+			hasNofollow := strings.Contains(v, "rel=\"nofollow\"")
+			hasSiteUrl := strings.Contains(v, controller.SiteUrl)
+			if !hasSiteUrl {
+				if !hasNofollow {
+					nofollowUrl := strings.Replace(v, "<a", "<a rel=\"nofollow\"", 1)
+					html = strings.Replace(html, v, nofollowUrl, 1)
+				}
+			}
+		}
+	}
+	return html
+}

internal/controller/template_controller.go

@@ -23,6 +23,8 @@ import (
 	"github.com/segmentfault/pacman/log"
 )
 
+var SiteUrl = ""
+
 type TemplateController struct {
 	scriptPath               string
 	cssPath                  string
@@ -67,6 +69,7 @@ func (tc *TemplateController) SiteInfo(ctx *gin.Context) *schema.TemplateSiteInf
 	if err != nil {
 		log.Error(err)
 	}
+	SiteUrl = resp.General.SiteUrl
 	resp.Interface, err = tc.siteInfoService.GetSiteInterface(ctx)
 	if err != nil {
 		log.Error(err)

pkg/converter/markdown.go

@@ -37,6 +37,7 @@ func Markdown2HTML(source string) string {
 	filter.AllowStyling()
 	filter.RequireNoFollowOnLinks(false)
 	filter.RequireParseableURLs(false)
+	filter.RequireNoFollowOnFullyQualifiedLinks(false)
 	html = filter.Sanitize(html)
 	return html
 }

ui/template/comment.html

@@ -3,7 +3,7 @@
 <div class="border-bottom py-2 comment-item border-top">
   <div class="d-block">
     <div class="fmt fs-14">
-      {{templateHTML .ParsedText}}
+      {{formatLinkNofollow .ParsedText}}
     </div>
   </div>
   <div class="d-flex justify-content-between fs-14">

ui/template/question-detail.html

@@ -28,7 +28,7 @@
           {{end}}
         </div>
         <article class="fmt text-break text-wrap mt-4">
-          {{templateHTML .detail.HTML}}
+          {{formatLinkNofollow .detail.HTML}}
         </article>
         <div class="mt-4">
           <div role="group" class="btn-group">
@@ -98,7 +98,7 @@
       {{range .answers}}
       <div id="10020000000000930" class="answer-item py-4">
         <article class="fmt">
-          {{templateHTML .HTML}}
+          {{formatLinkNofollow .HTML}}
         </article>
         <div class="d-flex align-items-center mt-4">
           <div class="">

ui/template/tag-detail.html

@@ -8,7 +8,7 @@
             >{{$.tag.SlugName}}</a
           >
         </h3>
-        <p class="text-break">{{templateHTML $.tag.ParsedText}}</p>
+        <p class="text-break">{{formatLinkNofollow $.tag.ParsedText}}</p>
       </div>
       <div>
         <div class="mb-3 d-flex flex-wrap justify-content-between">